[Li0.04(Na0.54K0.46)0.96](Nb1-0.04-XTaXSb0.04)O3 lead-free piezoelectric ceramics have been prepared by normal sintering at 1,100℃ for 5 h. X-ray diffraction analysis indicated that specimens demonstrate orthorhombic symmetry when Ta≤5 mol%. While transforming into tetragonal symmetry when x ≥ 20 mol%. These suggest that the orthorhombic and tetragonal phases co-exist in the ceramics with 5 mol% < Ta < 20 mol% at room temperature. All samples have high density, ranging from 4.46 to 4.79 g/cm3. As the result of SEM images, the grain growth was decreased with the increase of Ta substitution. The ceramics become ``softening``, leading to improvements in kp, ε r and d33, but a decrease in Qm. Excellent properties of kp= 0.46, d33= 293 pC/N, εr= 1,583 and Tc= 340℃ were obtained when Ta= 15 mol%
